*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
/*清楚间距*/

.clearfix:before,
.clearfix:after{
    content: '';
    display: block;
    clear: both;
}
/*清除浮动*/

header .container,
main .container,
footer .container{
    padding-left: 0;
    padding-right: 0;
}
/*清除左右内边距*/

header{
    background:url("../img/bg.jpg") no-repeat;
}


/*main 样式 开始*/
main{
    margin-top: 30px;
    margin-bottom: 50px;
}
main .form-control{
    width: 300px;
    float: left;
}
main select{
    margin: 0 30px;
}
main button{
    margin-left: 20px;
    width: 160px;
}
/*main 样式 结束*/